Optimizing glass-ceramic bonding incorporating new silane technology in an experimental universal adhesive formulation

Objective. Incorporating silane-coupling agent into universal adhesives (UAs) to simplify adhesive luting of glass-ceramic restorations appeared ineffective due to silane?s instability in an acidic aqueous solution. This study aimed to evaluate new silane technology added to an experimental UA to be bonded to glass ceramics without separate prior silanization. Methods. Combined silane technology, consisting of 3-(aminopropyl)triethoxysilane (APTES) and y-methacryloxypropyltriethoxysilane (yMPTES), was incorporated into an experimental UA formulation, being referred to as ADH-XTE (3M Oral Care). Immediate and aged shear bond strength (SBS) of ADH-XTE onto as-milled (?AM?), tribochemical silica-coated (?TSC?), HF-etched (?HF?), and mirror-polished (?MP?) glass-ceramic CAD/CAM blocks (IPS e.max CAD) with/without separate silanization was measured (n = 10/group). The control adhesives included Scotchbond Universal (?SBU?) and Scotchbond 1 XT (?SB1-XT?). The glass-ceramic surface topography and the fractography of the SBS-debonded specimens were observed by SEM.